Crossword Genius

Blood fluid (5)

Ross

I believe the answer is:

serum

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">blood fluid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for serum that I've seen before include "Watery part of blood" , "Blood component containing antibodies, used in immunisation" , "Antitoxin derived from blood" , "Liquid separating from coagulating blood" , "Watery liquid as from blister, or fluid in blood" .)

I've seen this clue in the Penny Press, the Sydney Morning Herald and the King Feature Syndicate.
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